Laser altimeter data obtained over sea-ice during the PS87 campaign in Aug-Sep, 2014; profile PS87_SBLA_20140811T1108_85.04_-1.80_thr06_data_Vers5@en

Sea ice surface roughness data were obtained during the PS87 campaign in Aug-Sep, 2014 with a Single Beam Laser Altimeter (SBLA) mounted inside an electromagnetic system (EM-Bird) towed at 10-30 m height above surface by a Helicopter (RV-Polarstern Helicopter). A method developed by Hibler (1972) was used to a) isolate the surface profile from low-frequency variations associated with the aircraft motion and b) to identify pressure ridge sails. The processing steps are described in https://epic.awi.de/id/eprint/56364/. We applied a ridge detection threshold of 0.6 m, which means that only sails higher 0.6 m are detected. Version and name of the processing routine: Laser_Altimeter_Processing_VS5_06_20.py (vers.5, Feb 22, 2024, https://gitlab.awi.de/sitem/sbla_processing.git). SBLA records (RIEGL - LD90) are provided at a sampling rate of 100 Hz. Sensor accuracy is 5 cm with a beam diameter at surface of 5.8 cm. This specific dataset was obtained on 20140811T1108. It includes recorded altimeter readings, the derived surface elevation and width/height/spacing of detected pressure ridge sails. Note on data quality: 5.8 cm . File name: [DMS/PANGAEA Campaing Identifier] + [DEVICE] + [DATE/TIME] + [LAT/LON] + [Detection Threshold] + [Object] + [Version] + [Format]海冰表面粗糙度数据采集于2014年8—9月开展的PS87科考航次，采用集成于电磁系统（EM-Bird）内的单波束激光高度计（Single Beam Laser Altimeter，SBLA）完成数据采集；该系统由‘极地号’科考直升机（RV-Polarstern Helicopter）以距海面10—30米的高度拖曳作业。 本次研究采用Hibler（1972）提出的方法完成两项核心处理：a）从与载机运动相关的低频噪声中分离出海面高程剖面；b）识别海冰压力脊帆（pressure ridge sails）。详细处理流程参见https://epic.awi.de/id/eprint/56364/。 本次处理设置的冰脊检测阈值为0.6米，即仅识别高度高于0.6米的冰脊帆。处理程序的版本与名称：Laser_Altimeter_Processing_VS5_06_20.py（版本5，2024年2月22日，https://gitlab.awi.de/sitem/sbla_processing.git）。 本次使用的SBLA设备为RIEGL LD90型号，数据采样率为100 Hz。该传感器的测量精度为5厘米，地表激光光斑直径为5.8厘米。 本数据集的采集时间为20140811T1108，即2014年8月11日11时08分，包含原始高度计读数、反演得到的海面高程，以及已检测冰脊帆的宽度、高度与间距。 数据质量说明：激光光斑直径为5.8厘米。 文件名命名规则：[DMS/PANGAEA科考航次标识] + [设备标识] + [日期/时间] + [经纬度] + [检测阈值] + [目标物] + [版本号] + [文件格式]